they sell them all over the place. It just adds a knob you unscrew to disconnect. I have them in my cars because the lightweight batteries don't hold their charge for very long. I've heard that locking your door with your key instead of pushing the alarm button on your fob helps save the battery. I don't think you need to get the metal jacket version of a battery, just adds weight and cost. The good thing about the Braille is they sell a nice bracket. Sadly, I think SpecialtyZ is out of stock of their nifty brackets. You could always have a shop fabricate one.
